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Abstract

We present a method that combines the Z-scan technique with nonlinear ellipse rotation (NER) to measure third-order nonlinear susceptibility components. The experimental details are demonstrated, and a comprehensive theoretical analysis is given. The validity of this method is verified by the measurements of the nonlinear susceptibility tensor of a well-characterized liquid, CS2.

Figures (5)

Fig. 1. (a) Experimental arrangement for NER modified Z-scan. D1 and D2 are the detectors. (b) and (c) are the geometry of incident and the transmitted polarization ellipse, respectively. The slow axis of the first λ/4 plate is taken along the x-axis. α is the angle between the first polarizer direction and the x-axis. θ is the rotating angle of the polarization ellipse induced by nonlinearity. φ is the angle of the analyzer.

Fig. 3. Z-scan curves of NER modified Z-scan with and without the second λ/4 plate. The polarization directions of the polarizer and the analyzer parallel each other (α=φ=-22.5°). The solid lines are the theoretical fittings with B = 12.6×10-20m2/V2 and I0 = 5.93 GW/cm2.

Fig. 4. (a) Normalized transmitted power through the analyzer at linear output and nonlinear output obtained by rotating the analyzer. (b) The ratio of nonlinear transmitted power to linear transmitted power as a function of rotation angle of the analyzer.